Buffer block



pr. m, wm.

1L.. 11E. hmmm@ BUFFER BLOCK Filed April l5 1921 if jfl;

are held by the clamping jaws. The plates 15 have ylongitudinally extending slots 19 forming clearances for the nuts, and the said clamping nuts have llanges 2O which bear againstvthe upper Surfaces of the plates with such friction as to retain them against movement, yet affording a means by which the plates may be released by backing the nuts. The anges are relatively Wide to present contacting surfaces which exert friction on the plates to effectively hold them when the nuts have been adjusted to cause the flanges to bear against the said plates.

It has been found in practice that a properly proportioned base Will be of such length as to receive sand paper of the conventional sizes and'permit the sand paper to embrace the ends of the base and extend slightly thereabove, in order that the surfaces of the sand. paper at the ends may be engaged by the clamps, as stated.

The screws l2 are shown as extending vertically through the base and through the post-s or lugs 9 and terminating in the recesses ll.

I claim:

l. In a buffer block, a body and a handle, the said handle having slots extending inwardly from the ends and recesses in the top with which the slots merge, threaded studs proj ectin g into the recesses, clamping element s having slotted portions extending through the slots of the handle into the recesses, members threaded on the studs and bearing on thc slotted portions of the clamps for frictionally retaining the clamps in place, the said clamps having aws overlying portions of the ends of the body and adapted to clamp sand paper against. the said ends.

2. In a buffer block, a base having a yieldable racing thereon slit longitudinally, the said base having a channel under. the slit portion of the facing, and means tor securing sand paper to the base.

LUTHER E. HAR RIS. 

